================================================================== BUG: KASAN: out-of-bounds in unwind_next_frame+0xc4/0xd0 arch/x86/kernel/unwind_frame.c:51 Read of size 8 at addr ffff8801c5727920 by task syz-executor0/13833 CPU: 0 PID: 13833 Comm: syz-executor0 Not tainted 4.9.132+ #51 ffff8801d0687198 ffffffff81b371b9 ffffea000715c9c0 ffff8801c5727920 0000000000000000 ffff8801c5727928 1ffff1003a0d0e61 ffff8801d06871d0 ffffffff81500bad ffff8801c5727920 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 [] unwind_next_frame+0xc4/0xd0 arch/x86/kernel/unwind_frame.c:51 [] __save_stack_trace+0x7d/0xf0 arch/x86/kernel/stacktrace.c:42 [] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71 [] proc_pid_stack+0x18f/0x290 fs/proc/base.c:483 [] proc_single_show+0xfd/0x170 fs/proc/base.c:785 [] seq_read+0x4b6/0x12d0 fs/seq_file.c:240 [] do_loop_readv_writev.part.1+0xd5/0x280 fs/read_write.c:718 [] do_loop_readv_writev fs/read_write.c:707 [inline] [] do_readv_writev+0x56e/0x7b0 fs/read_write.c:873 [] vfs_readv+0x84/0xc0 fs/read_write.c:897 [] kernel_readv fs/splice.c:363 [inline] [] default_file_splice_read+0x451/0x7f0 fs/splice.c:435 [] do_splice_to+0x10c/0x170 fs/splice.c:899 [] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971 [] do_splice_direct+0x1a3/0x270 fs/splice.c:1080 [] do_sendfile+0x4f0/0xc30 fs/read_write.c:1393 [] SYSC_sendfile64 fs/read_write.c:1448 [inline] [] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440 [] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb The buggy address belongs to the page: page:ffffea000715c9c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c5727800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c5727880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801c5727900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8801c5727980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c5727a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================